but defense secretary leon panetta warned that the threat of a defense cyber attack against america is already here. >> the collective result of these kinds of attacks could be a cyber pearl harbor. >> reporter: panetta warned that cyber attackers have tried to shut down america's critical infrastructure, power, water, transportation and major financial institutions. >> such a destructive cyber terrorist attack could virtually paralyze the nation. >> reporter: while russia and china are prime suspects, for the first time u.s. officials blame iran for the recent jump in cyber attacks. officials tell them iran was behind the recent attempts to disable the website to several u.s. banks. those attacks failed, but another attack nearly shut down saudi arabia's oil production. using a website, they destroyed 30,000 computers. experts say this complex attack should be a warning to the u.s. >> we do not have the proper level of security within the financial sector or the oil and gas sector, or any of our critical oil structures. >> reporter: officials say if they pose a threat, the u.s. could